Heel sole



FIG. 1 is a bottom plan view of a heel sole showing my new design in a position of use;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a bottom plan view;

FIG. 4 is a left side elevational view;

FIG. 5 is a right side elevational view;

FIG. 6 is a rear elevational view;

FIG. 7 is an inverted front elevational view;

FIG. 8 is a top plan view; and

FIG. 9 is a perspective view.

The broken line showing of a shoe in FIGS. 1 and 2 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a heel sole, as shown and described. 